MemLib – Low‑Level Memory Library for the Casio FX‑CP 400 (ClassPad 2)

A small, lightweight C++ library for messing directly with the memory of the Casio FX‑CP 400 / ClassPad 2.
Play with it, break stuff, learn things. Your device, your responsibility.

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Features

• Sleep(sec)
  Busy‑waits on the BCD second timer.

• ReadMemory(addr, size)
  Dumps raw bytes from any memory address into a std::vector<char>.

• WriteMemory(addr, data, size)
  Writes raw bytes directly into memory. Ideal for patching, modifying values, or runtime hacks.

• ExecuteFromAddr(addr)
  Jumps to an address and treats it as a function.
  If you know what's there, you can execute it.

• ExecuteShellcode(ptr)
  Executes raw shellcode via a function pointer.

• ReadControlRegister(ControlRegister controlRegister)

  Reads a Control Register and returns it value as a uint32_t Not all Control Registers are supported yet; more will be added.

• WriteControlRegister(ControlRegister controlRegister, uint32_t value)

  Writes a 32-bit value to a Control Register Not all Control Registers are supported yet; more will be added.

More features coming once I win my fight against motivation.

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Warning

This library gives you raw access to the ClassPad’s memory.
If you write to the wrong address, you will soft‑brick or hard‑brick the device.
Use responsibly — or irresponsibly, but knowingly.

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Installation (Windows)

1. Clone the repository

git clone https://github.com/PyCSharp/Memory-Library-for-HHK3
cd MemLib

2. Install WSL (Windows Subsystem for Linux) Open PowerShell as Administrator and run:

   wsl --install

   Then restart your computer.

3. Install Docker

   Download and install Docker Desktop: https://www.docker.com/products/docker-desktop/

4. Adjust project paths

   Edit startDocker.bat and set the path to your project.

5. Start Docker and build

   In your project directory:

   Open CMD:

   docker build -t memlib .

   startDocker

   Once the Docker terminal starts:

   cd /memlib
   make compile_commands.json
   make -j
   

6. Done

   Your compiled .hh3 file will appear in the /dist folder.

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Support

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Contact

• Discord: https://discord.gg/DScqwRvn5